Water-in-oil emulsion composition

Abstract

Disclosed is a water-in-oil type emulsion composition which exhibits excellent stability and is compounded with a stratum corneum softening oil component. The composition comprises (A) one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2-7, (B) one or more nonionic surfactants having an HLB of 7 or more, (C) one or more oil components selected from the group consisting of polar oils having an IOB value of 0.05-0.80, and (D) one or more oil components selected from the group consisting of magnesium sulfate, magnesium chloride, and sodium L-glutamate, and one or more salts selected from the group consisting of sodium citrate and sodium sulfate, the blending amount of the component (A) being 1% by weight or more with respect to the composition, and the blending amount of the component (B) being 0.4% by weight or less with respect to the composition.

Description

[0001] CROSS - REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority based on Japanese Patent Application No. 2022 - 212646 (filing date: December 28, 2022). The entire disclosure of the prior patent application is incorporated herein by reference as part of this specification. TECHNICAL FIELD

[0003] The present invention relates to a water - in - oil emulsion composition. BACKGROUND ART

[0004] As people age, as a phenomenon of skin aging, wrinkles increase. From the viewpoints of beauty and the like, especially women have a very high degree of attention to preventing and improving wrinkles. Generally, wrinkles are roughly classified into major wrinkles, minor wrinkles, and micro - wrinkles according to their generation sites, generation mechanisms, etc. Major wrinkles are relatively deep wrinkles mainly caused by photoaging on the forehead, the back of the neck, etc. Minor wrinkles are relatively shallow wrinkles generated at the corners of the eyes and the mouth. Micro - wrinkles are wrinkled folds generated in non - exposed parts such as the abdomen of the elderly.

[0005] Among these, especially regarding minor wrinkles, it has been reported that the wrinkle area ratio of people with a skin condition of low water content in the stratum corneum shows a high value (Non - Patent Document 1), and it has been clarified that minor wrinkles deteriorate due to a decrease in the water content of the stratum corneum caused by skin roughness and dryness. Due to the popularization of air conditioners, modern women's skin is often exposed to a dry environment even in summer, the trouble with minor wrinkles increases, and the attention to minor wrinkles also increases.

[0006] It has been found that softening the stratum corneum is effective for improving minor wrinkles (Non - Patent Documents 2 and 3), and several oil components have been found as components capable of softening the stratum corneum. As a means of allowing such an oil component to penetrate into the stratum corneum, it has been considered to apply a water - in - oil emulsion composition containing such an oil component to the skin. However, such a composition, for example, a water - in - oil emulsion composition containing a highly polar oil, has problems such as being prone to becoming unstable, being unable to maintain the viscosity of the composition, and separating. Therefore, the development of a stable water - in - oil emulsion composition containing a highly polar oil is underway.

[0007] For example, Patent Document 1 discloses a water-in-oil emulsion composition, which is characterized by being manufactured by a two-stage emulsification method. In this method, an aqueous solution component having the balance of water as the main component is heated and mixed into an oil-based gel component obtained by separately heating and mixing an oil-based component and an aqueous component, followed by cooling. The oil-based component is composed of (i) a specific polyglycerol fatty acid ester, (ii) a liquid oil-based substance, and (iii) a dextrin fatty acid ester esterified with a fatty acid containing a linear fatty acid and a branched fatty acid. The aqueous component is composed of (iv) glycerol and / or diglycerol and (v) a part of water. This composition is used for cosmetics, pharmaceutical bases, etc. with excellent storage stability, practical properties, and skin safety.

[0008] In addition, Patent Document 2 discloses a water-in-oil emulsion cosmetic, which is composed of the following components: Component (A1): at least one polyglycerol fatty acid ester selected from the group consisting of polyglycerol diisostearate, polyglycerol distearate, and polyglycerol dioleate, having an average degree of polymerization of glycerol of 5 to 12; Component (A2): at least one polyglycerol fatty acid ester selected from the group consisting of polyglycerol isostearate, polyglycerol stearate, and polyglycerol oleate, having an average degree of polymerization of glycerol of 5 to 12; Component (B): at least one oil agent selected from the group consisting of hydrocarbon oil, silicone oil, and ester oil; Component (C): water. The water-in-oil emulsion cosmetic has a specific weight and a specific weight ratio, and a viscosity of 2000 mPa·s or less. This composition has excellent removability for makeup cosmetics and a low viscosity, and is easily infiltrated into the substrate.

[0009] However, there is also a demand for a stable water-in-oil emulsion composition blended with a horny layer softening oil component.

[0010] Prior Art Documents

[0011] Patent Documents

[0012] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2003-119107

[0013] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2022-134970

[0014] Non-Patent Documents

[0015] Non-Patent Document 1: Fragrance Journal; 1992(11)29-42

[0016] Non-Patent Document 2: IFSCC Magazine, 20(1), 15-22, 2017

[0017] Non-Patent Document 3: International Journal of Cosmetic Science, 39(1), 66-71, 2017 Summary of the Invention

[0018] The inventors of the present invention have found that: a water-in-oil emulsion composition containing specific components and blended with a horny layer softening oil component exhibits excellent stability. The present invention is based on this insight.

[0019] Therefore, the present invention provides a water-in-oil emulsion composition that exhibits excellent stability and is blended with a horny layer softening oil component.

[0020] According to the present invention, the following technical solutions are provided.

[0021] (1) A water-in-oil emulsion composition, comprising:

[0022] (A) One or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7,

[0023] (B) One or more nonionic surfactants having an HLB of 7 or more,

[0024] (C) One or more oil components selected from the group consisting of polar oils having an IOB value of 0.05 to 0.80, and

[0025] (D) One or more salts selected from the group consisting of magnesium sulfate, magnesium chloride, sodium L-glutamate, sodium citrate, and sodium sulfate,

[0026] The blending amount of the component (A) is 1% by weight or more based on the composition, and the blending amount of the component (B) is 0.4% by weight or less based on the composition.

[0027] (2) The composition according to (1), wherein the component (A) is one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7 and selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, and polyglycerol polyricinoleate.

[0028] (3) The composition according to (1) or (2), wherein the component (A) is one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, and polyglycerol-6 polyricinoleate.

[0029] (4) The composition according to any one of (1) to (3), wherein the component (B) is one or more selected from the group consisting of polyglycerol fatty acid esters, polyoxyethylene alkyl ethers, and polyoxyethylene hydrogenated castor oils having an HLB of 7 or more.

[0030] (5) The composition according to any one of (1) to (4), wherein the component (B) is one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-10 stearate and polyglycerol-10 diisostearate and having an HLB of 10 or more.

[0031] (6) The composition according to any one of (1) to (5), wherein the blending amount of the component (B) is 0.05 to 0.2% by weight based on the composition.

[0032] (7) The composition according to any one of (1) to (6), wherein the component (C) is one or more oil components selected from the group consisting of polar oils having an IOB value of 0.1 to 0.5.

[0033] (8) The composition according to any one of (1) to (7), wherein the component (C) is one or more oil components selected from the group consisting of pentaerythritol tetra(ethylhexanoate), glycerol diisostearate, phytosterol / octyldodecyl lauroylglutamate, bis-diglycerol polyacyl adipate-2, dimer pentaerythritol hexa-hydroxy stearate, and castor oil.

[0034] (9) The composition according to any one of (1) to (8), wherein the blending amount of the component (D) is 0.5 to 1.5% by weight based on the composition.

[0035] (10) The composition according to any one of (1) to (9), which is a cosmetic composition.

[0036] According to the present invention, there can be provided a water-in-oil emulsion composition that exhibits excellent stability and contains a cutin-softening oil component. Detailed Description

[0037] According to one aspect of the present invention, there is provided a water-in-oil emulsion composition comprising: (A) one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7; (B) one or more nonionic surfactants having an HLB of 7 or more; (C) one or more oil components selected from the group consisting of polar oils having an IOB value of 0.05 to 0.80; and (D) one or more salts selected from the group consisting of magnesium sulfate, magnesium chloride, sodium L-glutamate, sodium citrate, and sodium sulfate. The blending amount of the component (A) in the composition is 1% by weight or more based on the composition. Further, the blending amount of the component (B) in the composition is 0.4% by weight or less based on the composition.

[0038] The component (A) in the water-in-oil emulsion composition of the present invention is one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7, preferably one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7 and selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, and polyglycerol polyricinoleate, more preferably one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, and polyglycerol-6 polyricinoleate. The component (A) in the water-in-oil emulsion composition of the present invention can be used as long as it is a commercially available product.

[0039] Regarding the blending amount of the component (A) in the water-in-oil emulsion composition of the present invention, there is no particular limitation as long as the blending amount relative to the total amount of the composition is 1% by weight or more, preferably 10% by weight or less, and more preferably 7% by weight or less.

[0040] The component (B) in the water-in-oil emulsion composition of the present invention is one or more nonionic surfactants having an HLB of 7 or more. Such nonionic surfactants are preferably highly hydrophilic surfactants having an HLB of 7 or more and selected from the group consisting of polyoxyethylene glycerol fatty acid esters, polyglycerol fatty acid esters, polyoxyethylene fatty acid esters, sucrose fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, and polyoxyethylene polyoxypropylene alkyl ether sugars, more preferably one or more selected from the group consisting of polyglycerol fatty acid esters, polyoxyethylene alkyl ethers, and polyoxyethylene hydrogenated castor oil having an HLB of 7 or more, more preferably polyglycerol fatty acid esters having an HLB of 10 or more, and more preferably one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-10 stearate and polyglycerol-10 diisostearate having an HLB of 10 or more. The nonionic surfactants in the present invention can be used as long as they are commercially available products, and there is no limitation. For example, "NikkolDecaglyn 1-SV" (manufactured by Nikko Chemicals Co., Ltd.), "NIKKOL Decaglyn 2-ISV" (manufactured by Nikko Chemicals Co., Ltd.), "NIKKOL Decaglyn 5-OV" (manufactured by Nikko Chemicals Co., Ltd.), "NIKKOL Decaglyn 5-SV" (manufactured by Nikko Chemicals Co., Ltd.), "NIKKOL BB-20" (manufactured by Nikko Chemicals Co., Ltd.), "NIKKOL HCO-60" (manufactured by Nikko Chemicals Co., Ltd.) etc. can be used.

[0041] Regarding the blending amount of the component (B) in the water-in-oil emulsion composition of the present invention, there is no particular limitation as long as the blending amount relative to the total amount of the composition is 0.4% by weight or less, preferably 0.05 to 0.2% by weight, and more preferably 0.05 to 0.1% by weight.

[0042] The component (C) in the water-in-oil emulsion composition of the present invention is one or more oil components selected from the group consisting of polar oils having an IOB value of 0.05 to 0.80, which are oil components commonly used in cosmetics, pharmaceuticals, foods, etc. The component (C) in the water-in-oil emulsion composition of the present invention preferably has an IOB value of 0.1 or more. In addition, the component (C) in the water-in-oil emulsion composition of the present invention preferably has an IOB value of 0.5 or less. The component (C) in the water-in-oil emulsion composition of the present invention is preferably one or more oil components selected from the group consisting of pentaerythritol tetra(ethylhexanoate), glycerin diisostearate, phytosterol / octyldodecyl lauroyl glutamate, bis-diglycerol polyacyl adipate-2, dipentaerythritol hexahydroxystearate, and castor oil. It should be noted that the IOB value is an abbreviation of Inorganic / Organic Balance (inorganic / organic balance value), which is a value representing the ratio of the inorganic value to the organic value and serves as an index indicating the polarity degree of an organic compound. Specifically, the IOB value is expressed as "IOB value = inorganic value / organic value". Here, regarding the "inorganic value" and "organic value" respectively, for example, the "inorganic value" and "organic value" corresponding to various atoms or functional groups are set such that the "organic value" becomes 20 for one carbon atom in the molecule and the "inorganic value" becomes 100 for one hydroxyl group. By accumulating the "inorganic values" and "organic values" of all atoms and functional groups in the organic compound, the IOB value of the organic compound can be calculated (for example, refer to Fujita, "Chemical Field", Vol. 11, No. 10, pp. 719-725, 1957).

[0043] The blending amount of the component (C) in the water-in-oil emulsion composition of the present invention is not particularly limited with respect to the total amount of the oil components in the water-in-oil emulsion composition of the present invention, and is preferably 30% by weight or more, more preferably 40% by weight or more. It should be noted that the oil components in the water-in-oil emulsion composition of the present invention are not particularly limited as long as they are substances commonly used in cosmetics, pharmaceuticals, foods, etc., and examples thereof include silicone oils, hydrocarbon oils, ester oils, higher alcohols having 12 to 22 carbon atoms, fatty acids having 12 to 22 carbon atoms, and fats and oils.

[0044] Examples of the silicone oil in the present invention include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; and cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydropolysiloxane.

[0045] Examples of the hydrocarbon oil in the present invention include, for example, liquid paraffin, squalane, squalene, pristane, paraffin, isoparaffin, hydrogenated polyisobutene, olefin oligomer, volatile hydrocarbon oil (such as isododecane, isocetane, undecane, tridecane, etc.).

[0046] Examples of the ester oil in the present invention include, for example, isopropyl myristate, cetyl ethylhexanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyl octanoate, cetyl lactate, myristyl lactate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol bis(2-ethylhexanoate), dipentaerythritol fatty acid ester, N-alkyl ethylene glycol monoisostearate, neopentyl glycol didecanoate, diisostearyl malate, glycerol bis(2-heptylundecanoate), trimethylolpropane tris(2-ethylhexanoate), trimethylolpropane triisostearate, triisostearin, pentaerythritol tetra(ethylhexanoate), glyceryl tri(ethylhexanoate) (glyceryl tri(2-ethylhexanoate)), cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, glyceryl tri(2-heptylundecanoate), methyl ricinoleate, oleyl oleate, cetearyl alcohol, acetyl glyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, bis(2-heptylundecyl) adipate, ethyl laurate, bis(2-ethylhexyl) sebacate, 2-hexyl decyl myristate, 2-hexyl decyl palmitate, 2-hexyl decyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, polypropylene glycol dineopentanoate, ethyl acetate, butyl acetate, amyl acetate, triester oil such as triethyl citrate, etc.

[0047] Examples of the higher alcohol having 12 to 22 carbon atoms in the present invention include, for example, oleyl alcohol, 2-decyltetradecanol, dodecanol, isostearyl alcohol, octyldodecanol, etc. Examples of the fatty acid having 12 to 22 carbon atoms include, for example, oleic acid, isostearic acid, linoleic acid, linolenic acid, etc.

[0048] Examples of the oil or fat in the present invention include, for example, cocoa seed butter, avocado oil, camellia seed oil, macadamia nut oil, corn oil, olive fruit oil, rapeseed oil, sesame seed oil, almond oil, wheat germ oil, camellia oleifera oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, coconut oil, rice bran oil, paulownia oil, tallow tree oil, jojoba oil, germ oil, triglyceride, glyceryl trioctanoate, glyceryl triisopalmitate, etc.

[0049] The component (D) in the water-in-oil emulsion composition of the present invention is one or more salts selected from the group consisting of magnesium sulfate, magnesium chloride, sodium L-glutamate, sodium citrate, and sodium sulfate.

[0050] The blending amount of the component (D) in the water-in-oil emulsion composition of the present invention is not particularly limited, preferably 0.5 to 1.5% by weight, more preferably 1 to 1.5% by weight.

[0051] The water-in-oil emulsion composition of the present invention may, if necessary, further contain optional additive components that are usually blended into cosmetics and the like within the range that does not impair the effects of the present invention. There is no limitation to such additive components, and examples thereof include thickeners such as cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methylhydroxypropyl cellulose, methyl cellulose, carboxymethyl cellulose, quince seed, carrageenan, pectin, mannan, gellan gum, chondroitin sulfate, starch, galactan, dermatan sulfate, glycogen, gum arabic, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, xanthan gum, mucopolysaccharide sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, guar gum, dextran, keratin sulfate, carob gum, succinoglucan, Trichosanthes kirilowii, chitin, chitosan, carboxymethyl chitin, agar; lower alcohols such as ethanol; antioxidants such as butylhydroxytoluene, tocopherol (vitamin E), phytic acid; antibacterial agents such as benzoic acid, salicylic acid, sorbic acid, alkyl p-hydroxybenzoates, hexachlorophene; benzoic acid-based ultraviolet absorbers such as p-aminobenzoic acid (hereinafter abbreviated as "PABA"), monoglyceryl PABA ester, N,N-dipropoxyethyl PABA, N,N-diethoxyethyl PABA, N,N-dimethyl PABA methyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA 2-ethylhexyl ester; anthranilic acid ester-based ultraviolet absorbers such as N-acetylanthranilic acid permanganate; salicylic acid-based ultraviolet absorbers such as amyl salicylate, menthyl salicylate, permanganate salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropylphenyl salicylate; cinnamic acid-based ultraviolet absorbers such as octyl cinnamate, ethyl 4-isopropylcinnamate, methyl 2,5-diisopropylcinnamate, ethyl 2,4-diisopropylcinnamate, methyl 2,4-diisopropylcinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate (2-ethylhexyl p-methoxycinnamate), 2-ethoxyethyl p-methoxycinnamate, cyclohexyl p-methoxycinnamate, ethyl α-cyano-β-phenylcinnamate, 2-ethylhexyl α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-p-methoxycinnamate;Silicone-based cinnamic acid ultraviolet absorbers such as [[3-bis(trimethylsilyloxy)methylsilyl-1-methylpropyl]]-3,4,5-trimethoxycinnamate, [[3-bis(trimethylsilyloxy)methylsilyl-3-methylpropyl]]-3,4,5-trimethoxycinnamate, [[3-bis(trimethylsilyloxy)methylsilylpropyl]]-3,4,5-trimethoxycinnamate, [[3-bis(trimethylsilyloxy)methylsilylbutyl]]-3,4,5-trimethoxycinnamate, [[3-tris(trimethylsilyloxy)silylbutyl]]-3,4,5-trimethoxycinnamate, [[3-tris(trimethylsilyloxy)silylbutyl]]-3,4,5-trimethoxycinnamate, [[3-tris(trimethylsilyloxy)silyl-1-methylpropyl]]-3,4-dimethoxycinnamate; Benzophenone-based ultraviolet absorbers such as 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octyloxybenzophenone, 4-hydroxy-3-carboxybenzophenone; Ultraviolet absorbers such as 3-(4'-methylbenzylidene)-d,l-camphor, 3-benzylidene-d,l-camphor, ethyl urocanate, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-tert-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-tert-butyldibenzoylmethane, 5-(3,3'-dimethyl-2-norbornanyl)-3-pentan-2-one; Organic acids such as acylsarcosine (e.g., sodium lauroylsarcosine), glutathione, citric acid, malic acid, tartaric acid, lactic acid; Vitamins such as vitamin A and its derivatives, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 and its derivatives, vitamin B12, vitamin B15 and its derivatives, vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, vitamin D, vitamin H, pantothenic acid, pantethine, nicotinamide, benzyl nicotinate;γ-Oryzanol, allantoin, glycyrrhizic acid (salt), glycyrrhetinic acid and its derivatives, tranexamic acid and its derivatives [as tranexamic acid derivatives, dimers of tranexamic acid (such as trans-4-(trans-aminomethylcyclohexanecarbonyl)aminomethylcyclohexane carboxylic acid hydrochloride, etc.), esters of tranexamic acid and hydroquinone (such as 4'-hydroxyphenyl trans-4-aminomethylcyclohexane carboxylate, etc.), esters of tranexamic acid and gentisic acid (such as 2-(trans-4-aminomethylcyclohexylcarbonyloxy)-5-hydroxybenzoic acid and its salts, etc.), amides of tranexamic acid (such as trans-4-aminomethylcyclohexane carboxylic acid methylamide and its salts, trans-4-(p-methoxybenzoyl)aminomethylcyclohexane carboxylic acid and its salts, trans-4-guanidinomethylcyclohexane carboxylic acid and its salts, etc.)], hinokitiol, bisabolol, Eucalptone, thymol, inositol, saikosaponin, ginsenoside, luffasaponin, saponins such as sapindus saponin, panthenol ethyl ether, ethinyl estradiol, tranexamic acid, arbutin, cepharanthine, (animal) placental protein and other various medicaments; extracts of plants such as Rumex japonicus, Sophora flavescens, Nuphar japonicum, Citrus sinensis, Salvia officinalis, Serratula tinctoria, Malva sylvestris, Swertia japonica, Thymus vulgaris, Angelica sinensis, Citrus aurantium, Betula platyphylla, Equisetum arvense, Luffa cylindrica, Aesculus hippocastanum, Saxifraga stolonifera, Leucanthemum vulgare, Lilium candidum, Artemisia princeps, Paeonia lactiflora, Aloe vera, Gardenia jasminoides, Chamaecyparis pisifera, etc.; pigments; porous and / or water-absorbent powders (such as starches obtained from corn, potatoes, etc., anhydrous silicic acid, talc, kaolin, magnesium aluminum silicate, calcium alginate, etc. powders); nonionic surfactants such as sorbitan monolaurate, sorbitan monopalmitate, sorbitan sesquioleate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyethylene glycol monooleate, polyoxyethylene alkyl ether, polyethylene glycol diether, lauroyl diethanolamide, fatty acid isopropanolamide, maltitol hydroxy fatty acid ether, alkylated polysaccharide, alkyl glucoside, sugar ester, etc.; cationic surfactants such as stearyl trimethyl ammonium chloride, benzalkonium chloride, lauryldimethylamine oxide, etc.; anionic surfactants such as sodium palmitate, sodium laurate, sodium laurate, potassium lauryl sulfate, triethanolamine ether of alkyl sulfate, Turkey red oil, linear dodecylbenzene sulfonic acid, polyoxyethylene hydrogenated castor oil maleate, acyl methyl taurine, etc.; amphoteric surfactants; neutralizing agents; preservatives; edible flavors; pigments, etc.

[0052] The water-in-oil emulsion composition of the present invention can be produced by a usual method for producing a water-in-oil emulsion composition, for example, by stirring and mixing an aqueous phase into an oil phase containing an emulsifier.

[0053] The composition of the present invention is not limited and can be made into a cosmetic composition. The cosmetic composition in the present invention refers to a composition used for cosmetic purposes.

[0054] Examples

[0055] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is expressed in weight %.

[0056] First, a screening of salts considered effective in suppressing the viscosity reduction of the water-in-oil emulsion composition was carried out. The aqueous phase was slowly added to the oil phase containing a surfactant to obtain a water-in-oil emulsion composition as shown in Tables 1 to 3 below. For each sample, the viscosity after 1 hour of preparation was measured using a VISCOMETER TVB-15H (manufactured by Toki Sangyo Co., Ltd.), rotor No. 6, and 10 rpm. Then, the viscosity after 4 weeks under the temperature condition of 50 °C was measured, and thus the change over time in the viscosity of each sample was measured. The measurement results (the reduction rate (%) of the viscosity after 4 weeks at 50 °C compared to the viscosity after 1 hour of preparation) are shown in Tables 1 to 3.

[0057] [Table 1]

[0058] Table 1: Evaluation results of the effect of various salts in suppressing the viscosity reduction of the water-in-oil emulsion composition

[0059] Test Example 1 Test Example 2 Test Example 3 Ion-exchanged water 51.1 51.1 51.1 Nitroglycerin 8 8 8 Dipropylene glycol 7 7 7 1,3-Butanediol 7 7 7 Polyethylene glycol 6000 1 1 1 Xanthan gum 0.2 0.2 0.2 Polyglycerol-4 oleate 1.35 1.35 1.35 Polyglycerol-6 oleate 0.9 0.9 0.9 Polyhydroxystearic acid 0.75 0.75 0.75 Hydrogenated polydecene 10.5 10.5 10.5 Pentaerythritol tetra(ethylhexanoate) 10.5 10.5 10.5 Sodium chloride 1 - - Magnesium sulfate - 1 - Magnesium chloride - - 1 Citric acid 0.02 0.02 0.02 Sodium citrate 0.08 0.08 0.08 <![CDATA[EDTA-3Na·2H2O]]> Appropriate amount Appropriate amount Appropriate amount Phenoxyethanol Appropriate amount Appropriate amount Appropriate amount Total (wt%) 100 100 100 Viscosity (mPa·s) after 1 hour of preparation 36900 26800 33500 Viscosity reduction rate (%) after 4 weeks at 50°C 66.12 -2.99 -3.58

[0060] [Table 2]

[0061] Table 2: Evaluation results of the effect of various salts in suppressing the viscosity reduction of the water-in-oil emulsion composition

[0062] Test Example 4 Test Example 5 Ion-exchanged water 51.1 51.1 Nitroglycerin 8 8 Dipropylene glycol 7 7 1,3-Butanediol 7 7 Polyethylene glycol 6000 1 1 Xanthan gum 0.2 0.2 Polyglycerol-4 oleate 1.35 1.35 Polyglycerol-6 oleate 0.9 0.9 Polyhydroxystearic acid 0.75 0.75 Hydrogenated polydecene 10.5 10.5 Pentaerythritol tetra(ethylhexanoate) 10.5 10.5 Sodium pyrrolidone carboxylate 1 - Citric acid 0.02 0.02 Sodium citrate 0.08 1.08 <![CDATA[EDTA-3Na·2H2O]]> Appropriate amount Appropriate amount Phenoxyethanol Appropriate amount Appropriate amount Total (wt%) 100 100 Viscosity (mPa·s) after 1 hour of preparation 32000 29900 Viscosity reduction rate (%) after 4 weeks at 50°C 66.88 -9.03

[0063] [Table 3]

[0064] Table 3: Evaluation results of the effect of various salts in suppressing the viscosity reduction of the water-in-oil emulsion composition

[0065] Test Example 6 Test Example 7 Test Example 8 Ion-exchanged water 51.6 51.1 50.6 Nitroglycerin 8 8 8 Dipropylene glycol 7 7 7 1,3-Butanediol 7 7 7 Polyethylene glycol 6000 1 1 1 Xanthan gum 0.2 0.2 0.2 Polyglycerol-4 oleate 1.35 1.35 1.35 Polyglycerol-6 oleate 0.9 0.9 0.9 Polyhydroxystearic acid 0.75 0.75 0.75 Hydrogenated polydecene 10.5 10.5 10.5 Pentaerythritol tetra(ethylhexanoate) 10.5 10.5 10.5 Sodium L-glutamate 0.5 1 1.5 Citric acid 0.02 0.02 0.02 Sodium citrate 0.08 0.08 0.08 <![CDATA[EDTA-3Na·2H2O]]> Appropriate amount Appropriate amount Appropriate amount Phenoxyethanol Appropriate amount Appropriate amount Appropriate amount Total (wt%) 100 100 100 Viscosity (mPa·s) after 1 hour of preparation 28100 30300 31000 Viscosity reduction rate (%) after 4 weeks at 50°C 6.41 10.89 10.00

[0066] It is shown from the results of Tables 1 to 3 that the water-in-oil emulsion compositions admixed with magnesium sulfate, magnesium chloride, sodium L-glutamate, and sodium citrate are stable.

[0067] Using a polyglycerol fatty acid ester-based surfactant, a highly polar oil component, and a salt, a water-in-oil type emulsified composition as shown in Table 4 below was prepared by a conventional method. For various samples, the viscosity was measured 1 hour after preparation by the same method as above, and then the viscosity was measured after 4 weeks under the temperature condition of 50 °C, whereby the change over time of the viscosity of various samples was measured (Evaluation A: change rate is 0 to 20.9%, Evaluation B: change rate is 21.0% to 34.9%, Evaluation C: 35% or more). In addition, for various samples, the freeze stability was evaluated by visual observation and optical microscopy (Evaluation A: no problem; Evaluation B: within an acceptable range, but there is some fusion; Evaluation C: water separation / separation). The measurement results are shown in Table 4.

[0068] [Table 4]

[0069] Table 4: Formulation and evaluation results of water-in-oil type emulsified composition

[0070]

[0071] From the results in Table 4, it can be seen that for the water-in-oil type emulsified composition of the present invention, little change over time in viscosity was observed, and in addition, good freeze stability was exhibited.

[0072] Next, using castor oil as a highly polar oil component, a water-in-oil type emulsified composition as shown in Table 5 below was prepared by a conventional method. For various samples, the change over time of viscosity and the freeze stability were evaluated by the same method / evaluation criteria as above. The results are shown in Table 5.

[0073] [Table 5]

[0074] Table 5: Formulation and evaluation results of water-in-oil type emulsified composition

[0075]

[0076] From the results in Table 5, it can be seen that for the water-in-oil type emulsified composition of the present invention obtained using castor oil, little change over time in viscosity was observed, and in addition, good freeze stability was exhibited.

[0077] Next, using polyglyceryl-10 stearate at various concentrations, a water-in-oil type emulsified composition as shown in Table 6 below was prepared by a conventional method. For various samples, the change over time of viscosity and the freeze stability were evaluated by the same method / evaluation criteria as above. The results are shown in Table 6.

[0078] [Table 6]

[0079] Table 6: Formulation and evaluation results of water-in-oil type emulsified composition

[0080]

[0081] As can be seen from the results in Table 6, the water-in-oil emulsion composition of the present invention exhibits good stability at various concentrations of polyglyceryl-10 stearate.

[0082] Next, a water-in-oil emulsion composition as shown in Table 7 below was prepared using polyglyceryl-10 diisostearate by a conventional method. For each sample, the change in viscosity over time and the freeze stability were evaluated by the same method / evaluation criteria as above. The results are shown in Table 7.

[0083] [Table 7]

[0084] Table 7: Formulation and evaluation results of water-in-oil emulsion composition

[0085]

[0086] As can be seen from the results in Table 7, for the water-in-oil emulsion composition of the present invention obtained using polyglyceryl-10 diisostearate, hardly any change in viscosity over time was observed, and moreover, good freeze stability was exhibited.

[0087] Next, four nonionic surfactants with an HLB of 7 or more were used to prepare a water-in-oil emulsion composition as shown in Table 8 below by a conventional method. For each sample, the change in viscosity over time and the freeze stability were evaluated by the same method / evaluation criteria as above. The results are shown in Table 8.

[0088] [Table 8]

[0089] Table 8: Formulation and evaluation results of water-in-oil emulsion composition

[0090]

[0091] As can be seen from the results in Table 8, for the water-in-oil emulsion composition of the present invention obtained using four nonionic surfactants with an HLB of 7 or more, hardly any change in viscosity over time was observed, and moreover, good freeze stability was exhibited.

[0092] As shown from the above results, compared with the conventional water-in-oil emulsion composition, the reduction in viscosity during storage at 50°C of the water-in-oil emulsion composition of the present invention is suppressed. Therefore, it is shown that the water-in-oil emulsion composition of the present invention is more stable than the conventional water-in-oil emulsion composition.

[0093] Other formulations

[0094] Formulation Examples 1 to 4 included within the range of the water-in-oil emulsion composition of the present invention are shown in Table 9.

[0095] [Table 9]

[0096] Table 9: Formulation Examples 1 to 4

[0097] Formulation Example 1 Formulation Example 2 Formulation Example 3 Formulation Example 4 Polyglycerol-4 oleate 2.25 2.7 - - Polyglycerol-6 oleate 1.5 1.8 - - Polyhydroxystearic acid 1.25 1.5 - - Polyglycerol-6 polyricinoleate - - 5 6 Polyglycerol-10 stearate 0.1 - - - Behenyl alcohol polyether-20 - 0.07 - - Polyglycerol-10 pentaoleate - - 0.15 - Polyglycerol-10 pentastearate - - - 0.1 Hydrogenated polydecene 10 10 10 7 Isocetane - - - 3 Pentaerythritol tetra(ethylhexanoate) 8 8 - 8 Glycerol diisostearate - - 5 - Phytosterol / octyldodecyl lauroyl glutamate - - 3 - Castor oil 5 5 5 5 Bis-diglycerol polyacyl adipate-2 2 2 1 1 Dimeric pentaerythritol hexahydroxystearate - - 1 1 Butylated hydroxytoluene Appropriate amount - - - Retinol 0.05 - - - Ion-exchanged water 41.55 35.63 40.55 39.70 Xanthan gum 0.2 0.2 0.2 0.2 Sodium L-glutamate 1 - - - Citric acid 0.02 0.02 0.08 0.1 Sodium citrate 0.08 0.08 0.02 0.9 Magnesium chloride - - 1 - Magnesium sulfate - 1 - - EDTA-3Na Appropriate amount Appropriate amount Appropriate amount Appropriate amount Glycerol 16 16 16 16 Diglycerol 2 2 2 2 Dipropylene glycol - 4 - 4 1,3-Butanediol 8 4 8 4 PEG-150 1 1 1 1 Niacinamide - 5 - - Tranexamic acid - - 1 - Potassium methoxysalicylate - - - 1 Phenoxyethanol Appropriate amount Appropriate amount Appropriate amount Appropriate amount Sodium metabisulfite - Appropriate amount Appropriate amount Appropriate amount Total (wt%) 100 100 100 100

Claims

1. An oil-in-water type emulsified composition, comprising: (A) one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7; (B) one or more nonionic surfactants having an HLB of 7 or more; (C) one or more oil components selected from the group consisting of polar oils having an IOB value of 0.05 to 0.80; and (D) one or more salts selected from the group consisting of magnesium sulfate, magnesium chloride, sodium L-glutamate, sodium citrate, and sodium sulfate, wherein the blending amount of the component (A) is 1% by weight or more based on the composition, and the blending amount of the component (B) is 0.4% by weight or less based on the composition.

2. The composition according to claim 1, wherein, The component (A) is one or more polyglycerol fatty acid esters having an average degree of polymerization of glycerol of 2 to 7 and selected from the group consisting of polyglycerol oleate, polyglycerol isostearate, and polyglycerol polyricinoleate.

3. The composition according to claim 1, wherein The component (A) is one or more polyglycerol fatty acid esters selected from the group consisting of polyglycerol-4 oleate, polyglycerol-6 oleate, polyglycerol-2 isostearate, and polyglycerol-6 polyricinoleate.

4. The composition according to claim 1, wherein The component (B) is one or more selected from the group consisting of polyglycerol fatty acid esters, polyoxyethylene alkyl ethers, and polyoxyethylene hydrogenated castor oil having an HLB of 7 or more.

5. The composition according to claim 1, wherein, The component (B) is one or more polyglycerol fatty acid esters having an HLB of 10 or more and selected from the group consisting of polyglycerol-10 stearate and polyglycerol-10 diisostearate.

6. The composition according to claim 1, wherein The blending amount of the component (B) is 0.05 to 0.2% by weight based on the composition.

7. The composition according to claim 1, wherein, The component (C) is one or more oil components selected from the group consisting of polar oils having an IOB value of 0.1 to 0.

5.

8. The composition according to claim 1, wherein The component (C) is one or more oil components selected from the group consisting of pentaerythritol tetra(ethylhexanoate), glycerol diisostearate, phytosterol / octyldodecyl lauroyl glutamate, bis-diglycerol polyacyl adipate-2, dipentaerythritol hexahydroxystearate, and castor oil.

9. The composition according to claim 1, wherein The blending amount of the component (D) is 0.5 to 1.5% by weight based on the composition.

10. The composition according to any one of claims 1 to 9, which is a cosmetic composition.

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